When your inbox is overflowing, nothing is worse than being copied on long email threads that don't pertain to you. Outlook's Ignore Conversation function can remove these emails from your inbox so that you can focus on important messages. Tagging an email with the Ignore Conversation function will send responses directly to the deleted items folder. You can also undo Ignore Conversation and recover emails still in your deleted items folder.
Put Outlook Clutter settings to work for you as well. Clutter won't delete emails, but it will send them to a low-priority folder. Once you're logged in to Outlook, go to the Settings menu and click on 'Options'. Choose 'Mail, Automatic Processing, and Clutter'. Select your desired settings to have your mail sorted automatically.